This image was acquired from
flickr. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
smithsonian institution smithsonianinstitution airfield airmail biplane airplane hangar cleveland ohio usa aviation aircraft us mail usmail us air mail usairmail us postal service uspostalservice de havilland dehavilland de havilland d.h. dehavillanddh d.h. dh airport planes national postal museum nationalpostalmuseum mail across